Hear the quietest sound from across the dome.

A student driver's nightmare.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

An unusual round church in London with a Templar past.

The longest hedge maze in the world.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

360° views of the city plus five floors of optical illusions and hands-on science.

A 30-acre garden inspired by the principles of modern physics.

Northern Ireland's Brobdingnagian stepping stones.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

Famously misunderstood wonder of the ancient world

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A kaleidoscopic warehouse-maze of handmade neon signs.

These fantastically named natural pools look like something out of a Scottish myth.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

A unique waterfall that some believe attracts the fairfolk.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.